A murder case of a ballet dancer with a strong sense of ritual led city bureau ace Chen Mu to lock in a mysterious genius - former psychology professor Lu Xingyun. Cards with his name are left at all cold case scenes.
Chen Mu hated his method of wandering into gray areas, but he had to rely on his talent for insight into people's hearts. One uses instinct to empathize with darkness, and the other uses logic to deconstruct human nature.
They were forced to partner up, and while solving a series of bizarre crimes, they moved from confrontation to symbiosis. However, when the "Cross Street Unsolved Case" that Chen Mu had been pursuing for many years reappeared, all the clues faintly pointed to Lu Xingyun's unknown past.
When trust completely collapsed, the real mastermind finally emerged. The goal of the ultimate puzzle he laid was not only to destroy the city, but also to completely extinguish Lu Xingyun's "light born of darkness."
Facing the most dangerous criminals, they must complete the final integration: let empathy become the coordinate of logic, and let logic become the blade of empathy.
